Boiler



March 1o, 1936.

G. J. GRAVES Er AL BOILER Filed Jan. 11, 1935 5 sheets-sheet 1 Marchi@ i935. e. J. GRAVES ET AL www BOILER Filed Jan. 11, 1953 3 Sheets-Sheet 2 March 10, 193s. J, GRAVES Er AL 2,033,425!

BOILER Filed Jan. 11, 1933 Patented Mar. 10, 1936 UNITED STATES PATENT GFFICE BOILER.

Application January 11, 1933, Serial No. 651,194

9 Claims.

Our invention relates to improvements in boilers and particularly to gas red automatic vapor, steam, or hot water boilers for house heating.

A primary object of our invention is to provide a boiler of the down draft type with increased capacity and economy without a corresponding increase in boiler size.

Another object is to provide a boiler the burner of which is contained in an inner removable casing.

A further object is to provide a combustion chamber having two bottom plates and a series of annular anges welded to its top.

A still further object is to provide an inner smoke box cover shell having horizontal projections equi-spaced on its outer periphery.

Other new and useful objects will be apparent from the following description and the accompanying drawings in which like numerals are employed to designate like parts throughout.

Figure l is a vertical section of a boiler embodying my invention;

Figure 2 is a front elevation thereof;

Figure 3 is a section on the line 3-3 of Figure 1;

Figure 4 is a section on the line 4 4 of Figure 1;

Figure 5 is a section on the line 5-5 of Figure 1;

Figure 6 is a plan View of the combustion chamber top; Figure 7 is a section on the line 1-1 of Figure 1;

Figure 8 is a side view of the inner smoke box shell;

Figure 9 is a plan view of the under side of the inner shell, and,

Figure 10 is an enlarged vertical section through the boiler wall at the point where the casings and combustion chamber meet.

The numerals II denote the supporting legs, and I2 the side wall of a combustion chamber mounted thereon. The combustion chamber has a bottom plate I3 pierced in its depressed center with a hose coupling I4 to carry oil possible leakage or condensation and also an inner bottom plate I5 with a large opening I6 formed in the same. A door I1 mounted in the lower front of the combustion chamber wall opens into the space formed between the plates I3 and I5.

by apparatus not shown. Mounted directly above the door I1 in grooves I8 formed in the ends of the combustion chamber wall I2 is a vertically sliding door I9, said door having an opening in its face closed by a hinged door 20, and a semi-circular opening 2| cutout midway of its bottom edge. This construction is best shown in Figures 2 and 5. The combustion chamber cover 22 (best shown in Figure 6) is shaped to t the contour of the side wall I2, 10 and has a circular opening 23, and upstanding annular flanges 24, 25, and 26, spaced around the said opening.

The numeral 21 indicates the circular casing, having upper and lower flue sheets 23 and 29 15 which hold in place vertical heat conducting tubes 30. 'I'he casing 21 is pierced for one or more inlet pipes 3|, and outlet pipe or pipes 32, and carriers a gauge 33. The boiler casing is composed of an inner shell 34, insulating material 35, and outer shell 36' which is best shown in Figure 1, these shells being pierced for the various water pipes and gauges. This arrangement forms a circular down draft chamber 36a between the boiler casing 21 and the 25 inner boiler shell 34. The smoke pipe connection 31 is welded to the lower back of the shell 34 and comes out through an opening in the outer shell 36. The shell 36 is lapped in the back so that it can be fitted over the smoke pipe connection 31.

An inwardly dished smoke box shell 38 having its outer edge bent downwards forming an annular flange 39 and having equi-spaced U- shaped brackets or projections 4I] extending hor- 35 izontally from the flange 39, is placed on the inner shell 34, the projections 46 touching the outer shell 36. This makes for equal spacing between the two Lshells as the act of packing insulating material between them would ordinarily cause the outside shell to move towards the inside shell at points where the insulating materials are packed the lightest. An outer smoke box shell 4I goes over the outer boiler shell 36 and the space between it and the inner 45 shell 38 is packed with insulating material 35.

The burner used consists of a feed pipe 42, cross pipe 43, and pieces of cast iron pipe 44 lelectrically welded at right angles to nipples 44a on the top of the cross pipe 43, the pipes 44 hav- 50 ing a double row of burner tip holes 45 spaced about one-half inch apart and drilled on an angle of about 30 from the horizontal lengthl of each of said pipes. The use of the nipples 44EL raises the burner tubes a short distance above 55 the cross pipe 43 and prevents flarebacks when the burner goes out. Short legs 43a are welded to the extreme ends of the cross pipe 43 to support the burner on the plate l5.

The burner is assembled in a steel or refractory cylindrical casing 46 of a height equal to the distance between the inner bottom plate l and the combustion chamber cover 22, and of a diameter slightly larger than the circular opening 23 in the combustion chamber cover. This forms a dead air space 46a between the burner casing and the outside wall I2 which tends to keep the outer Wall cool and prevents its paint from peeling oir. This air space is best shown in Figure 1. A small hinged door 4l is placed in .the upper front of the casing 46 through which the pilot or burner can be lighted or examined. Stops 48 welded to the upper surface of the plate l5 centralize the casing 46 in its proper position in the combustion chamber. An advantage of the inner burner casing 46 is that it forces the secondary air which enters through door Il and hole I6, to rise directly through and past the burner pipes thus insuring thorough combustion. This is best illustrated in Figure ,1.

To assemble the parts of the device the casing 46 which has the burner assembly mounted therein is inserted into the lower or combustion compartment until it strikes the stops 48, the burner being held level by the short legs 43a. The door I6 is then slid into place. The boiler assembly is then mounted inside of the guide ring or flange 24 and the shells 34 and 36 are placed around the iianges 25 and 26. The outer shell 36 is lapped in the back, so that it may fit over the smoke pipe 3l, and is held together by suitable screws or the like.

The various pipe nipples may then be screwed into place. 'Ihe inner smoke box shell 38 is then fitted to the top of the inner shell 34 after which insulating material 35 is packed between the wall shells 34 and 36. More insulating material 35 is packed on top the inner smoke box shell 3B after which the outer shell 4I is welded in place on top of the wall casing 36. It may be noted that all joints and connections are welded except the lap seam at the back of the outer shell 36, also that the assembly of the burner and the circular shell 46 are removable from the combustion chamber.

Having thus described our invention, what we wish to claim by Letters Patent is:

1. In a boiler, a combustion chamber having an outer wall and two spaced bottom plates, the upper plate having an opening in approximately its center, a door in the combustion chamber wall opening into the space between the said bottom plates, an inner combustion chamber comprising a casing removably mounted on the upper combustion chamber plate and enclosing the opening in the same, a burner Vmounted in and removable with the inner casing, and a heating chamber mounted on the combustion chamber.

2. In a boiler, a combustion chamber having an outer wall and two spaced bottom plates, the upper of said plates having a circular opening in its center portion, stops projecting from the upper surface of the upper plate around the sides and back of the circular opening, a door in the combustion chamber wall opening into the space between the two bottom plates, a circular shell removably placed on the upper combustion chamber plate and properly positioned by the stops, a burner lixed in the circular shell and removable with the same, and a heating chamber mounted on the combustion chamber.

3. In a boiler, a combustion chamber, a heating chamber mounted thereon, said heating chamber having walls comprising inner and outer shells with insulating material between same, a smoke box cover comprising inner and outer shells each of the shells having its edges bent into a downwardly extending flange seated on the tops on the inner and outer shells respectively, spaced projections extending horizontally and outwardly from the ilange of the inner smoke box cover shell, said projections being of such outward extent that the boiler shells will be held in their proper spaced relation.

4. In a boiler, a combustion chamber, a cover for said chamber having a large central opening, continuous vertical flanges spaced one within the other formed on the combustion chamber cover around the opening in the same, a boiler wall comprising inner and outer shells and a casing mounted on the combustion chamber cover, said shells and casing each iitting against one of the vertical anges on the said cover, and a smoke box cover comprising inner and outer shells each or the shells having its edges bent into a downwardly extendingl ange seatedon. the tops of the inner and outer boiler wall shells respectively, spaced projections extending horizontally and outwardly from the flange of the inner smoke box cover shell, said projections being of such outward extent that the boiler wall shells will be held in their proper spaced relation.

5. In a boiler, a combustion chamber, a cover for said chamber having a circular opening, annular upstanding iianges spaced one within the other xed on the combustion chamber top around the opening in the same, and a boiler wall comprising inner and outer wall shells, and a casing mounted on the combustion chamber each wall shell and the casing abutting one of the upstanding annular flanges, a smoke box cover comprising inner and outer shells, each of the shells having its edges bent into Aa down, wardly extending flange seated against and alongside the tops of the inner and outer boiler wall shells, respectively, spaced projections extending laterally from one smoke box cover flange toward the other and said projections being of such a length that the boiler wall shells will be held in their proper spaced relation.

6. In a boiler, a combustion chamber, a heating chamber mounted thereon, said heating chamber having an outer wall comprising inner and outer shells with insulating material between same, a smoke box cover comprising inner and outer shells, each of the shells having its edges bent into a downwardly extending flange seated against and alongside the tops of the inner and outer heating chamber shells, respectively, spaced projections extending laterally from one smoke box cover flange toward the other and said projections being of such a length that the heating chamber shells will be held in their proper spaced relation.

'7. In a boiler, a combustion chamber, an inner combustion chamber comprising a casing removably mounted therein, a burner mounted in the inner casing and removable with the same, a heating chamber mounted on the first named combustion chamber, said heating chamber having spaced walls, and a part closure for the upper end of said heating chamber comprising spacedly intertting caps having depending flanges and means for uniformly spacing said anges and carried by one of the same.

8. In a boiler, a combustion chamber having an outer Wall and tWo spaced bottom plates, the upper plate having an opening in approximately its center, a door in the combustion chamber Wall opening into the space between the said bottom plates, and an inner combustion chamber comprising a casing removably mounted on the upper combustion chamber plate and enclosing the opening ln the same.

9. In a boiler, a combustion chamber having an outer Wall and two spaced bottom plates, the upper plate having an opening in approximately its center, a door in the combustion chamber Wall opening into the space between the said bottom plates, an inner combustion chamber comprising a casing removably mounted on the upper combustion chamber plate and enclosing the opening in the same, and a burner mounted in and removable with the inner casing.

GEORGE J. GRAVES. EDWARD J. GRAVES. 

